Server Name versus Domain Web access

[Florez, Nestor]

Hello,

I have a server running RHEL 5 and it was renamed and given a new IP address
But now when I access its Drupal web site via the server name
http://servername it works fine but when I access the server's Drupal web site
using the entire domain name http://servename.domainname.com I get this warning:
warning: file(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution

This was not happening before the IP and server name change

I have check and compare the /etc/hosts*, /etc/resolve.conf, /etc/sysconfig/network
And other files against some of my other servers and I am not able to tell what is the difference.

Any ideas of what I should check on my RHEL 5 system?
Anything I should ask the network admins to check?

Thanks,

Néstor